Mixed mode erp process executing a mapreduce task

ABSTRACT

A search request received at a computer of a search support system is processed by analyzing the received search request to identify request parameters and connecting to a system index of the search support system that is referenced in the request parameters. An external result provider (ERP) process is initiated that establishes communication between the search support system and a data source external to the search support system, for a virtual index referenced in the request parameters. Thus, the ERP process provides an interface between the search support system and external data sources, such as by third parties. The ERP process can operate in a streaming mode (providing real-time search results with minimal processing) and/or a reporting mode (providing results with a greater delay and processing extent) and can switch between modes. The search request results are received from the connected system indexes and the referenced virtual indexes.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. application Ser. No.15/885,629 filed Jan. 31, 2018, which is itself a Continuation of U.S.application Ser. No. 15/339,951 filed Nov. 1, 2016 (issued as U.S. Pat.No. 9,916,385), which is a Continuation of U.S. application Ser. No.14/449,144 filed Jul. 31, 2014 (issued as U.S. Pat. No. 9,514,189),which is a Continuation of U.S. application Ser. No. 14/266,832, filedMay 1, 2014 (issued as U.S. Pat. No. 10,049,160), which is aContinuation of U.S. application Ser. No. 13/886,737, filed on May 3,2013 (issued as U.S. Pat. No. 8,738,629). The entire contents of each ofthe foregoing are hereby incorporated by reference in their entirety.

BACKGROUND

Search support systems typically provide an interface to users forsubmitting search requests to a database according to a file systemmaintained by the search support system. The database and file system ofthe search support system are transparent to the user. Such searchrequests are efficiently processed over the database, according to thefile system, and can be carried out in real time. Different searchsupport systems will typically have proprietary databases and uniquefile systems. For multiple searches over multiple databases of differentsearch support systems, users must login to each different searchsupport system and submit their search request.

Greater user convenience could be achieved if different databases couldbe accessed from a single login at a single search support system.Nevertheless, users would prefer not to achieve greater convenience atthe expense of delay in the search response time.

SUMMARY

In some aspects, a search request received at a computer of a searchsupport system is processed by analyzing the received search request toidentify request parameters and connecting to a system index of thesearch support system that is referenced in the request parameters. Anexternal result provider (ERP) process is initiated that establishescommunication between the search support system and a data sourceexternal to the search support system, for a virtual index referenced inthe request parameters. Thus, the ERP process provides an interfacebetween the search support system and external data sources, such as bythird parties. The ERP process can operate in a streaming mode(providing real-time search results with minimal processing) and/or areporting mode (providing results with a greater delay and processingextent) and can switch between modes. The search request results arereceived from the connected system indexes and the referenced virtualindexes.

Other features of the disclosed subject matter will be apparent from thefollowing description of the embodiments, which illustrate, by way ofexample, the principles of the disclosed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an example of a computer system thatprovides the features disclosed herein.

FIG. 2 is a flow diagram of an example of the processing performed bythe system illustrated in FIG. 1.

FIG. 3 is a diagrammatic representation of the parameters in a searchrequest processed by the system illustrated in FIG. 1.

FIG. 4 is a block diagram of a system configuration for the systemillustrated in FIG. 1 for performing searches on HADOOP externalsources.

FIG. 5 is a block diagram of an example showing a computer system thatoperates in the FIG. 1 system.

FIG. 6 is a representation of operating mode features available in theERP processes illustrated in FIG. 1.

FIG. 7 is a block diagram showing details of the ERP process of FIG. 1for search request processing of a Hadoop data source.

FIG. 8 is a flow diagram of an example of the processing performed bythe ERP process of FIG. 1.

DETAILED DESCRIPTION

FIG. 1 shows a block diagram of an example of a computer search supportsystem 100 that provides the disclosed features. A search support systemmay be any system enabling the management, storage, and retrieval ofdata. In recent years, search support systems involving semi-structuredor completely unstructured data have become more common. Exemplarysystems of this kind include Splunk Enterprise produced by Splunk Inc.of San Francisco, Calif. Other exemplary systems of this kind includeHadoop, Cassandra, and MongoDB. A subset of search support systems thatoperate on unstructured data also provide late binding schema, whichimposes structure on the data at query time rather than at storage oringestion time.

A core engine 102 of the search support system receives search requestsfrom one or more client devices 104 over network connections. FIG. 1illustrates that multiple client devices 104 a, 104 b, . . . , 104 n maycommunicate with the core engine 102; the devices will be collectivelyreferred to without their respective suffixes as client devices 104. Theclient devices 104 may communicate with the core engine using a varietyof connections. For example, one client device in FIG. 1 is illustratedas communicating over an Internet (Web) protocol, another client deviceis illustrated as communicating via a command line interface, andanother client device is illustrated as communicating via a systemdeveloper kit (SDK). These illustrated communication connections, andsuitable alternatives, will be known to those skilled in the art. Theellipses between the client devices indicate additional and differentclient devices that may be included in the system 100.

The core engine 102 analyzes the received search request to identifyrequest parameters. The search support system 100 is typicallyconfigured to interface with data collections that are maintainedaccording to support system protocols, and are often maintained in anaccess scheme that is proprietary to the support system. Throughout thisspecification, such data collections that are “local” or “native” to thesearch support system are referred to as an “index” or “indices.” An“indexer” is a system included in a search support system that managesone or more indices, thereby providing a search interface to access datain the index for the search support system.

If a search request received from one of the client devices 104references an index maintained by the search support system, then asearch head process 106 of the core engine 102 connects to one or moresystem indexers 108 of the search support system 100 for the indexreferenced in the request parameters. That is, if the request parametersof the search request reference an index, then the search head processacess the data in the index via the indexer. FIG. 1 illustrates thatmultiple indexers 108a, 108b may be provided with the core engine 102.When referenced in general, the indexers will be collectively referredto without their respective suffixes as indexers 108. The core engine102 may include one or more indexers 108, depending on system accessresources and requirements. As described further below, the indexers 108retrieve data from their respective local indices as specified in thesearch request. The indexers and their respective local indicestypically reside on the same system, though they may be connected via alocal network connection. FIG. 1 shows each indexer 108 a, 108 b with acorresponding respective local index 109 a, 109 b.

If the request parameters of the received search request reference anexternal data collection, which is not accessible to the indexers 108 orunder the management of the search support system, then the FIG. 1search suport system 100 will access the external data collectionthrough an External Result Provider (ERP) process. Throughout thisspecification, an external data collection is referred to as a “virtualindex” (plural, “vritual indices”). An ERP process provides an interfacethrough which the search head 106 may access virtual indices.

Thus, a search reference to an index of the system is understood torelate to a locally stored and managed data collection, but a searchreference to a vitual index is understand to relate to an externallystored and managed data collection, which the search head must accessthrough one or more ERP processes. FIG. 1 shows two ERP processes 110,112 that connect to respective remote (external) virtual indices, whichare indicated as a Hadoop system 114 and a relational databasemanagement system (RDBMS) 116. Other virtual indices may include otherfile organizations and protocols, such as Structured Query Language(SQL) and the like. The ellipses between the ERP processes 110, 112indicate optional additional ERP processes of the system 100. An ERPprocess is a computer process that is initiated or spawned by the searchhead process 106 and is executed by the core engine 102.

The search head process 106 may spawn only a single ERP process inresponse to multiple virtual indexes referenced in a search request, orthe search head may spawn different ERP processes for different virtualindices. Generally, viritual indices that share common dataconfigurations or protocols may share ERP processes. For example, allsearch query references to a Hadoop file system may be processed by thesame ERP process, if the ERP process is suitably configured. Likewise,all search query references to a SQL database may be processed by thesame ERP process. In addition, the search head may provide a common ERPprocess for common external data source types (i.e., a common vendor mayutilize a common ERP process, even if the vendor includes different datastorage system types, such as Hadoop and SQL). Common indexing schemesalso may be handled by common ERP processes, such as flat text files orWeblog files.

The search head process 106 determines the number of ERP processes to beintiated via the use of configuration parameters that are included in asearch request message. Generally, there is a one-to-many relationshipbetween an external results provider “family” and ERP processes, andthere is also a one-to-many relationship between an ERP process andcorresponding virtual indexes that are referred to in a search request.For example, using RDBMS, assume two independent instances of such asystem by one vendor, such as one RDBMS for production and another RDBMSused for development. In such a situation, it is likely preferable (butoptional) to use two ERP processes, to maintain the independentoperation as between production and development data, but both of theERPs will belong to the same family, because the two RDBMS system typesare from the same vendor. Continuing the example, assume that threevirtual indexes are defined for each of the ERP processes, with avirtual index reference indicated by “vix”, the three virtual indexesare: prod_vix_1, prod_vix_2, and prod_vix_3 (in the production system)and dev_vix_1, dev vix_2, and dev_vix_3 (in the development system). Ifthe search request is such that a single ERP process can provide resultsfor more than one virtual index referenced in the search request, thenonly one ERP process will be spawned by the search head process 106. Forexample, if the search request is of the form:

index=dev vix 1 OR index=dev vix 2,

then the search head process will determine that the two arguments “devvix 1” and “de vix_2” involve a common virtual index, namely, “dev”. Thesearch head process will spawn only the “dev” ERP process, and that ERPprocess will be asked to provide results for both referenced virtualindexes. When the search request has a different format, such as:

index=dev vix_1 OR index=dev vix_2 OR index=prod_vix_3,

then the search head process will determine that the search requestcontains two arguments “dev vix_1” and “dev vix_2” with a common virtualindex, namely, “dev”, and the search request also contains an argument“prod_vix _3” with a “prod” virtual index. The search head process willdetermine that two ERP processes are needed: one for the prod index andanother for the dev indexes. In this way, the search head processdetermines the number and type of ERP processes needed to satisfy thesearch request, and the search head process will instantiate or spawnthe corresponding determined ERP processes.

The ERP process 110, 112 may receive a search request from the searchhead process 106, which may also provide request analysis such asdescribed above. The search head process may optimize the receivedsearch request for execution at the respective external virtual index.Alternatively, the ERP process may receive a search request as a resultof analysis performed by the search head process or by a differentsystem process. The ERP process 110, 112 communicates with the searchhead process 106 via conventional input/output routines (e.g., standardin/standard out). In this way, the ERP process receives the searchrequest from a client device such that the search request may beefficiently executed at the corresponding external virtual index.

The ERP process 110, 112 may be provided as a process of the core engine102. Each ERP process may be provided by the core engine, or may beprovided by process or application providers who are independent of thesearch support system 100. Each respective ERP process may include aninterface application installed at a computer of the external resultprovider that ensures proper communication between the core engine andthe external result provider. As described further below, the ERPprocesses 110, 112 will generate appropriate search requests in theprotocol and syntax of the respective virtual indices 114, 116 each ofwhich corresponds to the search request received by the core engine 102.Upon receiving search results from their corresponding virtual indices,the respective ERP process passes the result to the search head 106,which may return the results to the core engine for processing and maythen terminate operation of the respective ERP process 110, 112.

FIG. 1 shows that the client devices 104 communicate with the coreengine 102 through a conventional network interface, such as through theInternet protocol, indicated as HTTP access 120 in FIG. 1.Communications with the core engine continue after the network access toa search pre-processing block 122, which may perform format checking,authorization processing, and the like.

System Operations

FIG. 2 shows a flow diagram of an example of the processing performed bythe system illustrated in FIG. 1. At the first operation, indicated bythe flow diagram box numbered 202, the core engine receives a searchrequest from a client device and analyzes the search request. Theanalysis includes request processing, such as protocol checking syntaxchecking, and the like. More particularly, the core engine parses thesearch request to identify all commands in the request and to identifytwo portions of the search request: a local portion and a remoteportion. The local portion identifies the part of the search requestthat can only be performed by the search head process. The remoteportion identifies the part of the search request that can be executedon the indexers or by external result providers for remote (external)data sources and corresponding ERP processes. The core engine thendetermines all the indexers that would provide data for the non-virtualindexes referenced in the search request.

At the next operation, indicated by the box 204, the core engine usesthe search head process to connect to any local indexers (local datasources) in the search support system referenced in the received searchrequest. The indexers are provided with the received search request.

The next operation, indicated by the box numbered 206, is for the coreengine to determine any virtual indexes referenced in the receivedsearch request. Such search request references may comprise, forexample, an identification of an external result provider or other thirdparty indices from which search results are desired, such as theaforementioned Hadoop, RDBMS, and SQL. The determination of virtualindexes is a result of the search request analysis performed by thesearch head process.

The next operation, indicated by the box 208, is for the search head toinitiate an ERP process for the determined virtual indexes. As notedabove, a single ERP process may be spawned or instantiated for groups ofvirtual indexes, or a single ERP process may be spawned for each virtualindex, as determined by the search head process. An ERP process is aprocess that is executed in the core engine operating systemenvironment.

In the next operation, indicated by the box numbered 210, the ERPprocesses 110, 112 (FIG. 1) generate a search request and pass it to acorresponding external result provider (i.e., virtual indices 114, 116)such that the search request to the external result provider correspondsto the search request passed to the indexers 108. The core engine 102passes the received search request to the proper ERP processes toretrieve the desired search results. The search request includesoperating parameters, configuration information, and arguments forproper runtime implementation. The search request is passed to an ERPprocess as part of the request to spawn the ERP process, in the actionarguments of the search request. The search head process 106 optimizesthe search request for each virtual index for which the ERP process willprovide results. The ERP process, however, is free to ignore theoptimized search request and provide a much larger superset of theresults. That is, the search head process is responsible for the finalfiltering of the results returned by the ERP process and forguaranteeing the result set is correct.

As noted above, an ERP process can request results for more than onevirtual index referenced in a search request. Because a search requestcan reference more than one virtual index, more than one external resultprovider may be spawned by a search request. In the FIG. 1 system, asingle ERP process may be given responsibility for multiple referencedindexes. In such a configuration, one ERP process is initiated by thesearch head for all the referenced virtual indexes for which that ERPprocess is responsible. Alternatively, each ERP process may be assignedresponsibility for a single corresponding virtual index.

The core engine 102 and search head process 106 ultimately receive thesearch request results from the indexers 108, and also from the ERPprocesses 110, 112. This operation is indicated by the box 212 in FIG.2. The search head process receives the search results, includingintermediary results that are returned with search results updated inreal time and final results that comprise results of the search requestafter the request processing on the recited indices are completed.

Configuration Parameters

FIG. 3 is a diagrammatic representation 300 of the parameters in asearch request that is passed by the system illustrated in FIG. 1. FIG.3 shows that the parameters in a search request include actioninformation 302, configuration information 304, and action arguments306. The particular format and content of the parameters 300 will dependon the search support system 100 in use. In the FIG. 1 system, theaction information comprises a search indicator, the configurationinformation reflects the indexer information for the system 100 (FIG.1), and the runtime arguments include information such as a time rangeover which the index will be searched, text of the search string in therequest, and the like.

As an example of search request processing, a search request maycomprise the following text string:

index=main OR index=vix_1|stats count by index

After the search request is processed and optimized by the search headprocess, the local portion of the search request (i.e., what is executedon the search head process) comprises the portion of the search requestas follows:

stats count by index

and the remote portion of the search request comprises a combination oflocal and remote references, the remote portion of the search request asfollows: index=main prestats count by index (remote part executed byindexers) index=vix_1 prestats count by index (remote part executed byERP). In this example, the original search request string does notcontain any reference to “prestats”, this command is added by the searchhead process during the analysis of the search request and is used topush down computation tasks to remote systems (indexers or ERPs).

FIG. 4 is a block diagram representation of details for a systemconfiguration of the system illustrated in FIG. 1 for performingsearches on Hadoop external sources. That is, the Hadoop system 114illustrated in FIG. 1 provides an interface to a Hadoop-based datasystem. FIG. 4 shows that the Hadoop system 114 includes a Hadoopdistributed file system (HOFS) component 404 and a Map Reduce component406, as will be known to those skilled in the art.

Exemplary Hardware System

The systems and methods described above may be implemented in a numberof ways. One such implementation includes computer devices havingvarious electronic components. For example, components of the system inFIG. 1 may, individually or collectively, be implemented with deviceshaving one or more Application Specific Integrated Circuits (ASICs)adapted to perform some or all of the applicable functions in hardware.Alternatively, the functions may be performed by one or more otherprocessing units (or cores), on one or more integrated circuits orprocessors in programmed computers. In other embodiments, other types ofintegrated circuits may be used (e.g., Structured/Platform ASICs, FieldProgrammable Gate Arrays (FPGAs), and other Semi-Custom ICs), which maybe programmed in any manner known in the art. The functions of each unitmay also be implemented, in whole or in part, with instructions embodiedin a memory, formatted to be executed by one or more general orapplication-specific computer processors.

FIG. 5 provides a block diagram of a computer system 500 forimplementing functions and operations as described herein. The computersystem 500 may implement, for example, any one or all of the searchsupport system 100, core engine 102, client devices 104, search head106, indexer 108, ERP processes 110, 112, and virtual indices 114, 116as illustrated in FIG. 1. It should be noted that FIG. 5 is meant onlyto provide a generalized illustration of various components, any or allof which may be utilized as appropriate. FIG. 5, therefore, broadlyillustrates how individual system elements may be implemented in arelatively separated or relatively more integrated manner.

The system 500 is shown comprising hardware elements that can beelectrically coupled via a system bus 526 (or may otherwise be incommunication, as appropriate). The hardware elements can include one ormore central processor units (CPUs) 502, including without limitationone or more general-purpose processors and/or one or morespecial-purpose processors (such as communication processing chips,graphics acceleration chips, and/or the like); one or more input devices504, that can include, without limitation, a mouse, a keyboard, and/orthe like; and one or more output devices 506, which can include withoutlimitation a display device, a printer, audio device, and/or the like.

The computer system 500 may further include (and/or be in communicationwith) one or more storage devices 508, which can comprise, withoutlimitation, local and/or network accessible storage and/or can include,without limitation, a disk drive, a drive array, an optical storagedevice, solid-state storage device such as a random access memory(“RAM”), and/or a read-only memory (“ROM”), which can be programmable,flash-updateable, and/or the like. The computer system 500 might alsoinclude a communications subsystem 514, which can include withoutlimitation a modem, a network card (wireless or wired), an infra-redcommunication device, a wireless communication device and/or chipset(such as a Bluetooth device, an 502.11 device, a WiFi device, a WiMaxdevice, cellular communication facilities, etc.), and/or the like. Thecommunications subsystem 514 may permit data to be exchanged with anetwork 515, and/or any other devices described herein. The network 515may comprise a local area network (LAN) or a network such as theInternet, or a combination. In many embodiments, the computer system 500will further include a working memory 518, which can include a RAM orROM device, as described above.

The computational system 500 also may comprise software elements, shownas being currently located within the working memory 518, including anoperating system 524 and/or other program code, such as one or moreapplication programs 522, which may comprise computer programsperforming tasks and operations described above, and/or may be designedto implement methods in accordance with the disclosed subject matterand/or systems in accordance with the disclosed subject matter, asdescribed herein. Merely by way of example, one or more proceduresdescribed with respect to the method(s) discussed above might beimplemented as code and/or instructions executable by a computer (and/ora processor within a computer). In one embodiment, the data generatingand presenting operations are implemented as application programs 522.In the description herein, references to “interface” and “processor” and“application” should be understood as referring to hardware, software,and combinations of the two, either as independent components (hardware,software, and/or both) for each interface, processor, or application, oras integrated components combined with one or more other components.

A set of these instructions and/or code may be stored on a computerreadable storage medium 510 b. In some embodiments, the computerreadable storage medium 510 b may comprise the storage device(s) 508described above. In other embodiments, the computer readable storagemedium 510 b might be incorporated within the computer system. In stillother embodiments, the computer readable storage medium 510 b might beseparate from the computer system (i.e., it may be a removable readablemedium, such as a compact disc, etc.), and or might be provided in aninstallation package, such that the storage medium can be used toprogram a general purpose computer with the instructions/code storedthereon. These instructions might take the form of executable code,which is executable by the computer system 500 and/or might take theform of source and/or installable code, which, upon compilation and/orinstallation on the computer system 500 (e.g., using any of a variety ofgenerally available compilers, installation programs,compression/decompression utilities, etc.), then takes the form ofexecutable code. In these embodiments, the computer readable storagemedium 510 b may be read by a computer readable storage media reader 510a.

It will be apparent that variations may be made in accordance withspecific requirements. For example, customized hardware might also beused, and/or particular elements might be implemented in hardware,software (including portable software, such as applets, etc.), or both.Further, connection to other computing devices such as networkinput/output devices may be employed.

In one embodiment, local and remote computer systems (such as thecomputer system 500) are utilized to perform methods of the disclosedsubject matter. According to a set of embodiments, some or all of theprocedures of such methods are performed by the computer system 500 inresponse to the processor 502 executing one or more sequences of one ormore instructions (which might be incorporated into the operating system524 and/or other code, such as an application program 522) contained inthe working memory 518. Such instructions may be read into the workingmemory 518 from another machine-readable medium, such as one or more ofthe storage device(s) 508 (or 510). Merely by way of example, executionof the sequences of instructions contained in the working memory 518might cause the processor(s) 502 to perform one or more procedures ofthe methods described herein.

The terms “machine readable medium” and “computer readable medium,” asused herein, refer to any medium that participates in providing datathat causes a machine to operate in a specific fashion. In an embodimentimplemented using the computer system 500, various machine-readablemedia might be involved in providing instructions/code to processor(s)502 for execution and/or might be used to store and/or carry suchinstructions/code (e.g., as data transmissions or data communications).In many implementations, a computer readable medium is a physical and/ortangible storage medium. Such a medium may take many forms, includingbut not limited to, volatile and non-volatile media. Non-volatilecomputer-readable media includes, for example, optical or magneticdisks, such as the storage device(s) (508 or 510). Volatilecomputer-readable media includes, without limitation, dynamic memory,such as the working memory 518. In some implementation, data may becarried over transmission media. Transmission media includes coaxialcables, copper wire, and fiber optics, including the wires that comprisethe bus 526, as well as the various components of the communicationsubsystem 514 (and/or the media by which the communications subsystem514 provides communication with other devices). Hence, transmissionmedia can also take the form of waves (including, without limitation,radio, acoustic, and/or light waves, such as those generated duringradio-wave and infra-red data communications).

Common forms of physical and/or tangible non-volatile computer readablemedia include, for example, a floppy disk, a flexible disk, hard disk,magnetic tape, or any other magnetic medium, a CD-ROM, any other opticalmedium, punchcards, papertape, any other physical medium with patternsof holes, a RAM, a PROM, an EPROM, a FLASH-EPROM, any other memory chipor cartridge, or any other medium from which a computer can readinstructions and/or code.

Various forms of machine-readable media may be involved in carrying oneor more sequences of one or more instructions to the processor(s) 502for execution. Merely by way of example, the instructions may initiallybe carried on a magnetic disk and/or optical disc of a remote computer.A remote computer might load the instructions into its dynamic memoryand send the instructions communications over a transmission medium tobe received and/or executed by the computer system 500. Thesecommunications, which might be in the form of electromagneticcommunications, acoustic communications, optical communications, and/orthe like, are all examples of carrier waves on which instructions can beencoded, in accordance with various embodiments of the disclosed subjectmatter.

The communications subsystem 514 (and/or components thereof) generallywill receive the communications, and the bus 526 then might carry thecommunications (and/or the data, instructions, etc. carried by thecommunications) to the working memory 518, from which the processor(s)502 retrieves and executes the instructions. The instructions receivedby the working memory 518 may optionally be stored on a storage device508 either before or after execution by the processor(s) 502.

ERP Process Features

The ERP processes described above may include two operation modes, astreaming mode, and a reporting mode. The ERP processes can operate instreaming mode only, or reporting mode only, or in both modessimultaneously. Operating in both modes simultaneously is referred to asmixed mode operation. Further, it will be appreciated that in mixed modeoperation, the ERP at some point can stop providing the search head withstreaming results and only provide reporting results thereafter, or thesearch head at some point may start ignoring streaming results it hasbeen using and only use reporting results thereafter.

The streaming mode returns search results in real time with minimalprocessing, in response to the search request. The reporting modeprovides results of a search request with processing of the searchresults prior to providing them to the requesting search head process,which in turn provides results to the requesting client device. ERPoperation with such multiple modes provides greater flexibility in theperformance of the ERP process with regard to report time, searchlatency, and resource utilization.

In mixed mode operation, both streaming mode and reporting mode areoperating simultaneously. The streaming mode results (i.e., the raw dataobtained from the external data source) are provided to the search headprocess, which can then process the results data (e.g., break the rawdata into events, timestamp it, filter it, and the like) and integratethe results data with the results data from other external data sources,and/or from data stores of the search head process. The search headprocess performs such processing and can immediately start returninginterim results to the user at the requesting client device, providingthe streaming mode results, while the search head process issimultaneously waiting for the ERP process to process the data it isretrieving from the external data source as a result of the concurrentlyexecuting reporting mode.

In some instances, the ERP process initially operates in a mixed mode,such that the streaming mode operates to enable the ERP quickly toreturn interim results (i.e., some of the raw, or unprocessed, datanecessary to respond to a search request) to the search head, enablingthe search head to process it and start providing to the client orsearch requester interim results that are responsive to the query.Meanwhile, in this mixed mode, the ERP also operates concurrently inreporting mode, processing portions of raw data in a manner responsiveto the search query. Upon determining that it has results from reportingmode available to return to the search head, the ERP may halt mixed modeat that time (or some later time) by stopping the return of data instreaming mode to the search head, switching to reporting mode only. TheERP at this point starts sending interim results in reporting mode tothe search head, which in turn may then present this processed dataresponsive to the search request to the client or search requester.Typically the search head switches from using results from the ERP'sstreaming mode of operation to results from the ERP's reporting mode ofoperation at the point where the higher bandwidth results from thereporting mode outstrips the amount of data processed by the search headin the lower bandwidth streaming mode of ERP operation.

One reason reporting mode is typically higher bandwidth is because theERP does not have to spend time transferring to the search head forprocessing all the raw data, and another reason is because the ERP mayoptionally direct another processor to do the processing.

One should recognize that it is not necessary to halt at any point thestreaming mode of operation to gain the higher bandwidth benefits ofreporting mode; the search head could simply stop using the streamingmode results—and start using the reporting mode results—at some point atwhich the bandwidth of the reporting mode has caught up with or exceededthe amount of bandwidth provided by the streaming mode. Thus, a varietyof triggers and ways to accomplish a switch from the search head usingor the ERP transferring streaming mode results to reporting mode resultsmay occur to one skilled in the art.

The reporting mode can involve the ERP process (or an external system)performing event breaking, time stamping, filtering of events to matchthe search query request, and calculating statistics on the results.Whether or not events are the ultimate answer to a search query, orwhether or not statistics are the ultimate answer, depends on the searchquery request specified by the user. The user can request particulartypes of data, such as where the search query itself involves types ofevents, or the search request may ask for statistics on data, such as onevents that meet the search request; either query phrasing is possible.In either case, the search head process understands the query languageused in the received query request, which may be a proprietary language.For example, the search head process may understand the query languageused by the assignee of the application, Splunk Inc. (a query languagecommonly called SPL, or Splunk Processing Language) and the search headprocess typically understands how to use that language to obtain datafrom the indexers (See FIG. 1), which store data in a Splunk-specificformat.

The ERP processes support the search head process, as the search headprocesses are not ordinarily configured to understand the format inwhich data is stored in external data sources such as Hadoop or SQL datasystems. Rather, the ERP process performs that translation from theformat for what has been requested by the search query that has beensubmitted in the search support system's native format (e.g., SPL ifSplunk Enterprise is used as the core system) to the format in which asearch query request will be accepted by the corresponding external datasystem. The external data systems typically store data in a differentformat from that of the search support system's native index format, andutilize a different query language (e.g., SQL or MapReduce, rather thanSPL or the like).

As noted, the ERP process can operate in the streaming mode alone. Afterthe ERP process has performed the translation of the query requestreferred to above, and once the ERP process has returned the raw resultsfrom the streaming mode, the search head process can operate on thereturned data and can integrate the returned data with any data obtainedfrom local data sources (i.e., native to the search support system) andfrom other external data sources and from other ERP processes (if suchoperations were required to satisfy the terms of the search query).Thus, one advantage of mixed mode operation is that, in addition tostreaming mode, the ERP process is also executing concurrently in thereporting mode, so that the ERP process (rather than the search headprocess) is processing query results (e.g., performing event breaking,timestamping, filtering, and possibly calculating statistics if requiredto be responsive to the search query request). It should be apparentthat additional time is needed for the ERP process to perform theprocessing in such a configuration. Therefore, the streaming mode willallow the search head process to start returning interim results to theuser at the client device before the ERP process can complete sufficientprocessing to start returning any search results. The switchover betweenstreaming and reporting mode happens when the ERP process determinesthat the switchover is appropriate, such as when the ERP processdetermines it can start returning meaningful results from its reportingmode.

The operation described above illustrates the source of operationallatency: streaming mode has low latency (one obtains immediate results)and usually has relatively low bandwidth (fewer results can be returnedper unit of time), whereas the concurrently running reporting mode hasrelatively high latency (it has to perform a lot more processing beforereturning any of the results) and usually has relatively high bandwidth(more results can be processed per unit of time). For example, when theERP process does start returning report results, it returns a lot more(processed) results than in the streaming mode, because, e.g.,statistics only need to be calculated to be responsive to the searchrequest. That is, the ERP process doesn't have to take time to firstreturn raw data to the search head process. As noted, the ERP processcould be configured to operate in streaming mode alone and return justthe raw data for the search head process to process in a way that isresponsive to the search request (which may have requested certain typesof events, or statistics on those events). Alternatively, the ERPprocess can be configured to operate in the reporting mode only. Alsoalternatively, the ERP process can be configured to operate in streamingmode and reporting mode concurrently, as described, with the ERP processstopping the transmission of streaming results to the search headprocess when the concurrently running reporting mode has caught up andstarted providing results. The reporting mode does not require theprocessing of all raw data that is responsive to the search queryrequest before the ERP process starts returning results, rather, thereporting mode usually performs processing of chunks of events at a timeand returns the processing results to the search head for each chunk.

For example, an ERP process can be configured to perform as simply asreturning the contents of a search result file verbatim, with little orno processing of results, such that a search head process performs allprocessing such as breaking byte streams to events, filtering, and thelike, or the ERP process can be configured to perform more flexibly,such as analyzing the search request and handling all the computationthat a native search indexer process would otherwise perform. In thisway, the configured ERP process provides greater flexibility in featureswhile operating according to desired preferences in terms of responselatency and resource requirements.

FIG. 6 is a representation of operating mode features available in theERP processes illustrated in FIG. 1. FIG. 6 shows a table 600 with threecolumns, a left-most column 601 indicating what each row shows, column602 that shows operating features available with the streaming mode ofthe ERP process, and a column 604 that shows operating featuresavailable with the reporting mode of the ERP process.

Row 610 of table 600 identifies the communication channel for the twomodes. In this example, both modes are identified as providing standard,conventional communication routines for receiving and/or transmittingmessages. Row 612 identifies an ERP output type. In streaming mode, theoutput includes raw data. For example, an ERP process operating onexternal data source with a flat text file in the streaming mode wouldreturn the actual text data from the data source that is received fromthe source in response to the search request, with little or noprocessing. In reporting mode, the output includes processed data (e.g.,including statistics or determinations of received data in accordancewith the search request). For example, the ERP process can identifysubdivisions in the received data and can determine data valuefrequencies of occurrence in the received data. Such processed data canbe presented in a report format according to parameters of the searchsupport system or according to the search request.

Row 614 identifies which component performs schema binding, which caninclude, e.g., breaking a received byte stream into events or recordsand/or extracting a time stamp. In the ERP streaming mode, schemabinding is performed by the search head. Meanwhile, in the ERP reportingmode, schema binding is performed by the ERP. Row 616 identifies whichcomponent performs processing, such as filtering, statistics and/oraggregation. In streaming mode, the processing is performed by thesearch head. Specifically, the search head takes the raw data from theERP, schematizes it, and then performs processing on it. In reportingmode, processing is performed by the ERP or by an external system thatis directed and/or controlled by the ERP.

Row 618 identifies which component generates a final search result. Thegeneration can include, e.g., merging results from the ERP with resultsfrom other ERPs and/or with results from local indices. In both modes,the final result generation is performed by the search head. Instreaming mode, it is performed after the search head processes resultsfrom the ERP. In reporting mode, the generation can be immediatelyperformed upon receiving the processed results, as the ERP performed theprocessing. Row 620 identifies the tradeoffs for the respective modes.As shown, the reporting mode results in greater latency and bandwidthrelative to the streaming mode. It will be appreciated that the modescan be operated concurrently, though it is generally more difficult toprogram a mixed-mode ERP process. For example, streaming mode operationis relatively easy to configure, and the ERP process can be configuredto operate that mode only.

It should be noted that the streaming mode, the ERP returns raw data tothe search head process in a continuous manner (e.g., returns thecontents of a file—raw data—as it is retrieved), whereas in thereporting mode, the ERP returns processed data (such as filteredresults, aggregates and/or statistics determined by processing the rawdata) as portions of the data are processed by the ERP or under thedirection of the ERP, though the time required to process a block of rawdata in reporting mode will typically mean that the ERP first startsreturning results in reporting mode after it has started to return rawdata in streaming mode. It should be noted that an ERP process that canoperate in the reporting mode should also be able to operate in thestreaming mode so that if the user specifies a search that requires noprocessing, the data can be provided by the ERP.

As mentioned, the ERP provides the results it generates to the searchhead. The search head operates on the output of the streaming mode, aswell as of the reporting mode, and integrates the information with dataresponsive to the search request from any local data stores and fromother virtual indices as provided by other ERP processes. As notedthough, before integration, in results provided by an ERP in streamingmode, if the data provided is unstructured, then the search processneeds to first bind schema to the data to extract valuable informationfrom that data to provide fields on which that data can be operated onand/or searched by the search support system; exemplary schema bindingmay include breaking the raw data up into separate events and extractingtime stamps from the events.

Because a search support system with a late binding schema can use ERPsto access unstructured or structured data from virtual indices and thenalso make that data searchable in the same way it makes its locallyindexed data searchable, ERPs are especially useful in such systems. Ifthe search support system were not late binding or could not deal withunstructured data, it might be difficult to access and make use ofunstructured data from a virtual index.

FIG. 7 is an example of details for ERP processing as applied to aHadoop virtual index. FIG. 7 shows some details from FIG. 1. In FIG. 7,the ERP process 112 is shown communicating with the HDFS 404 of theHadoop system 114, with the double-ending arrow 702 representing thecommunication that occurs between the ERP process and the HDFS. Thearrow 704 represents the search request being submitted to the MapReduce block 406, and the curved arrow 706 represents the search resultsbeing communicated to the HDFS for output.

An example of Hadoop processing involves a user search request togenerate a report based on a number of files residing in an HDFS datasystem. Thus, the search support system uses a virtual index (i.e., theHDFS system) that contains all the requested files, and the ERP processhas been correctly configured with parameters or configurations such ashost, port, credential information, and the like. Assuming the ERPprocess for Hadoop is a reporting ERP which can also operate in mixedmode (i.e., operation in streaming and reporting mode), upon receiving asearch request, the ERP process operates as follows:

-   -   (a) the ERP process starts operation in streaming mode,        streaming files responsive to the query;    -   (b) concurrently with (a), the ERP process starts executing a        MapReduce job (made up of many tasks) to create reports for the        files in the Hadoop system, the details of which will be known        to those skilled in the art;    -   (c) at a later time, the ERP process stops operating in the        streaming mode as soon as the first MapReduce task completes,        that is, the ERP process switches from streaming mode to        reporting mode only in response to completion of the first        MapReduce task. Thus, the reporting mode operation supports        returning of results after completion of each MapReduce task.        The reporting mode is continuous and doesn't wait until complete        processing of all of the data in the external data source has        occurred before returning results to the search support system,        but it often doesn't return results as quickly as the streaming        mode does.

FIG. 8 is a flow diagram of an example of the processing performed bythe ERP process of FIG. 1. FIG. 8 shows that caching operations may besupported by the FIG. 1 system, regardless of whether the ERP operatesin streaming mode, reporting mode, or mixed mode. Examples of some waysto cache data in response to search queries are discussed in U.S.application Ser. No. 13/664231, entitled “Transparent IndexSummarization,” assigned to the assignee of the current application. Thecontents of the U.S. application Ser. No. 13/664231 are herebyincorporated by reference in their entireties for all purposes. In thefirst operation illustrated in FIG. 8, indicated by the flow diagramdecision box numbered 802, the ERP process determines if cached resultsfor the received query are available. Such determination occurs prior tothe ERP processing any chunk of events or other data from the externaldata source. The determination by the ERP processor of available cachedresults will be determined by considering the events being processed andthe search being executed.

In the case of cached results being available, an affirmative outcome atthe box 802, the ERP process retrieves the cached results, as indicatedat the box 804. The ERP process then returns the retrieved results fromcache to the search head process (box 806). The ERP process thencontinues with subsequent retrieval of remaining data for which thecache contains no results.

In the case of no cached results available, a negative outcome at thebox 802, the ERP process then processes the data in the external datasource, data typically comprising events, as indicated at box 808. Theprocessing comprises executing the received search query on the externaldata source. The ERP process then returns the results obtained from theprocessing to the search head process, as indicated at box 810.

After executing the received search query, the ERP process determines ifcaching the obtained results from processing the data according to thesearch query (box 808) would be beneficial. This decision, indicated bythe box 812, is based on considerations such as the amount of time spentgenerating the obtained results, the size of the results as compared tothe input events, and the frequency of the search query (including, forexample, if some or any of these exceed thresholds). It should be notedthat the ERP process has access to such computed and accumulated dataand statistics. Other ways to determine whether caching search resultsis beneficial are explored in the aforementioned U.S. application Ser.No. 13/664231, entitled “Transparent Index Summarization,” assigned tothe assignee of the current application.

If the ERP process determines that it would be of no benefit to cachethe results, a negative outcome at the box 812, then the ERP processthen continues with subsequent processing. If the ERP process determinesthat it would be beneficial to cache the results, an affirmative outcomeat the box 812, then the ERP process stores the obtained results incache for later retrieval, as indicated by the box 814. The cache may bemaintained in either the search support system, connected storage, or inthe external data sources, such that the cache will be accessible tooperations at the decision box 802, that is, to be accessible to the ERPprocesses of the search support system.

It will be appreciated that many processing capabilities in addition tothose described are possible, without departing from the teachingsaccording to the disclosed subject matter. Further, it should be notedthat the methods, systems, and devices discussed above are intendedmerely to be examples. Various embodiments may omit, substitute, or addvarious procedures or components as appropriate. For example, it shouldbe appreciated that, in alternative embodiments, the methods may beperformed in an order different from that described, and that varioussteps may be added, omitted, or combined. Also, features described withrespect to certain embodiments may be combined in various otherembodiments. Different aspects and elements of the embodiments may becombined in a similar manner. Also, it should be emphasized thattechnology evolves and, thus, many of the elements are examples andshould not be interpreted to limit the scope of the disclosed subjectmatter.

Specific details are given in the description to provide a thoroughunderstanding of the embodiments. However, it will be understood by oneof ordinary skill in the art that the embodiments may be practicedwithout these specific details.

Also, it is noted that the embodiments may be described as a processwhich is depicted as a flow diagram or block diagram. Although each maydescribe the operations as a sequential process, many of the operationscan be performed in parallel or concurrently. In addition, the order ofthe operations may be rearranged. A process may have additional stepsnot included in the figures.

Other variations are within the spirit of the present disclosed subjectmatter. Thus, while the disclosed subject matter is susceptible tovarious modifications and alternative constructions, certain illustratedembodiments thereof are shown in the drawings and have been describedabove in detail. It should be understood, however, that there is nointention to limit the disclosed subject matter to the specific form orforms disclosed, but on the contrary, the intention is to cover allmodifications, alternative constructions, and equivalents falling withinthe spirit and scope of the disclosed subject matter, as defined in theappended claims.

Recitation of ranges of values herein are merely intended to serve as ashorthand method of referring individually to each separate valuefalling within the range, unless otherwise indicated herein, and eachseparate value is incorporated into the specification as if it wereindividually recited herein. All methods described herein can beperformed in any suitable order unless otherwise indicated herein orotherwise clearly contradicted by context.

What is claimed is:
 1. A method comprising: receiving, by a first devicefrom an external data system, files that are responsive to a searchrequest; employing a streaming mode to begin streaming the files fromthe first device to a second device that is employable by a local datasystem; employing a reporting mode to cause the first device to executea MapReduce task, while concurrently employing the streaming mode, tocreate a report for the files; and in response to completing theMapReduce task, causing the first device to stop streaming the files andto send the report to the second device.
 2. The method of claim 1,wherein causing the first device to execute a MapReduce task comprisescausing the first device to execute a MapReduce job comprising aplurality of MapReduce tasks creating a plurality reports for the files,the method further comprising, upon completion of each of the MapReducetasks, causing the first device to pause streaming the files and send acorresponding one of reports to the second device.
 3. The method ofclaim 1, wherein causing the first device to stop streaming the filescomprises pausing the streaming while sending the report to the seconddevice.
 4. The method of claim 1, further comprising determining tocommunicate the report to the second device.
 5. The method of claim 1,wherein the MapReduce task is one of a plurality of MapReduce taskscreating a plurality reports, the method further comprising determiningto send each of the plurality of reports upon completion of acorresponding one of the plurality of MapReduce tasks.
 6. The method ofclaim 1, the method further comprising causing the second device toswitch from using the files from the streaming mode to using resultsfrom the reporting mode based on a determination that using the resultsfrom the reporting mode is more efficient than using the streaming mode.7. The method of claim 1, wherein the external data system is a HADOOPdata system.
 8. The method of claim 1, further comprising determining tocache the report as a cached search result for the search request suchthat the cached search result is usable as a response in a subsequentreceived search request.
 9. The method of claim 1, further comprisingdetermining that a cached search result produced by a previous receivedsearch request is available to satisfy at least a portion of the searchrequest.
 10. The method of claim 1, further comprising determining toemploy the reporting mode based on the search request.
 11. One or morenon-transitory computer-readable storage media, storing instructions,which when executed by one or more processors cause performance ofoperations comprising: receiving, by a first device from an externaldata system, files that are responsive to a search request; employing astreaming mode to begin streaming the files from the first device to asecond device that is employable by a local data system; employing areporting mode to cause the first device to execute a MapReduce task,while concurrently employing the streaming mode, to create a report forthe files; and in response to completing the MapReduce task, causing thefirst device to stop streaming the files and to send the report to thesecond device.
 12. The one or more non-transitory storage media of claim11, wherein causing the first device to execute a MapReduce taskcomprises causing the first device to execute a MapReduce job comprisinga plurality of MapReduce tasks creating a plurality reports for thefiles, the operations further comprising, upon completion of each of theMapReduce tasks, causing the first device to pause streaming the filesand send a corresponding one of reports to the second device.
 13. Theone or more non-transitory storage media of claim 11, wherein causingthe first device to stop streaming the files comprises pausing thestreaming while sending the report to the second device.
 14. The one ormore non-transitory storage media of claim 11, the operations furthercomprising determining to communicate the report to the second device.15. The one or more non-transitory storage media of claim 11, whereinthe MapReduce task is one of a plurality of MapReduce tasks creating aplurality reports, the operations further comprising determining to sendeach of the plurality of reports upon completion of a corresponding oneof the plurality of MapReduce tasks.
 16. The one or more non-transitorystorage media of claim 11, the operations further comprising causing thesecond device to switch from using the files from the streaming mode tousing results from the reporting mode based on a determination thatusing the results from the reporting mode is more efficient than usingthe streaming mode.
 17. The one or more non-transitory storage media ofclaim 11, wherein the external data system is a HADOOP data system. 18.The one or more non-transitory storage media of claim 11, the operationsfurther comprising determining to cache the report as a cached searchresult for the search request such that the cached search result isusable as a response in a subsequent received search request.
 19. Theone or more non-transitory storage media of claim 1, the operationsfurther comprising determining that a cached search result produced by aprevious received search request is available to satisfy at least aportion of the search request.
 20. The one or more non-transitorystorage media of claim 11, the operations further comprising determiningto employ the reporting mode based on the search request.
 21. Acomputing system comprising: one or more processors; and a memorycoupled with the one or more processors, the memory having instructionsstored thereon, which, when executed by the one or more processors,cause the computing system to perform operations comprising: receiving,by a first device from an external data system, files that areresponsive to a search request; employing a streaming mode to beginstreaming the files from the first device to a second device that isemployable by a local data system; employing a reporting mode to causethe first device to execute a MapReduce task, while concurrentlyemploying the streaming mode, to create a report for the files; and inresponse to completing the MapReduce task, causing the first device tostop streaming the files and to send the report to the second device.22. The system of claim 21, wherein causing the first device to executea MapReduce task comprises causing the first device to execute aMapReduce job comprising a plurality of MapReduce tasks creating aplurality reports for the files, the operations further comprising, uponcompletion of each of the MapReduce tasks, causing the first device topause streaming the files and send a corresponding one of reports to thesecond device.
 23. The system of claim 21, wherein causing the firstdevice to stop streaming the files comprises pausing the streaming whilesending the report to the second device.
 24. The system of claim 21, theoperations further comprising determining to communicate the report tothe second device.
 25. The system of claim 21, wherein the MapReducetask is one of a plurality of MapReduce tasks creating a pluralityreports, the operations further comprising determining to send each ofthe plurality of reports upon completion of a corresponding one of theplurality of MapReduce tasks.
 26. The system of claim 21, the operationsfurther comprising causing the second device to switch from using thefiles from the streaming mode to using results from the reporting modebased on a determination that using the results from the reporting modeis more efficient than using the streaming mode.
 27. The system of claim21, wherein the external data system is a HADOOP data system.
 28. Thesystem of claim 21, the operations further comprising determining tocache the report as a cached search result for the search request suchthat the cached search result is usable as a response in a subsequentreceived search request.
 29. The system of claim 21, the operationsfurther comprising determining that a cached search result produced by aprevious received search request is available to satisfy at least aportion of the search request.
 30. The system of claim 21, theoperations further comprising determining to employ the reporting modebased on the search request.